.386
.model flat, stdcall
.stack 4096
ExitProcess proto,
dwExitCode: dword

.data segment
  sum dword 0

..code
_main proc
        mov    eax, 25
        mov    eax, 50
        add    eax, ebx
        mov    sum, eax

        INVOKE ExitProcess, 0
_main endp
end _main
